Alexander James Jeffrey "Alex" Horne (born 10 September 1978) is a British comedian. Horne is the creator of Taskmaster, a comedy panel show in which he is the assistant to "Taskmaster" Greg Davies, who judges comedians on various absurd tasks they are asked to perform. He is also the host of "The Horne Section", a live music variety show which has been broadcast on BBC Radio 4.

He made his first appearance at the Edinburgh festival in 2000 with his show, "How To Avoid Huge Ships".[7] His 2003 Edinburgh show, "Making Fish Laugh" was nominated for a Perrier newcomer award.[8] In 2004 he won a Chortle Award for Best Breakthrough Act. His shows with Tim Key have been "Every Body Talks" and "When in Rome", both of which featured unusually extensive use of Microsoft PowerPoint for a comic act. Horne toured Roman towns of the UK with the "When in Rome" show in early 2006.

As a solo performer, Horne then wrote and performed "Birdwatching" at the 2007 Edinburgh Festival and "Wordwatching" at the 2008 Edinburgh Festival. He signed a two-book deal with Virgin Publishing to write up both of these stories as books. The first, entitled Birdwatchingwatching, came out early in 2009. The second came out in early 2010. On 18 January 2007, Horne became the first ever comedian to perform in Second Life for a feature on Sky News. In 2011 he compered "The Horne Section", a comedy variety show.[9] "Alex Horne Presents The Horne Section" has run for three series on BBC Radio 4.

Between 24 October 2006 and 24 October 2007 he worked alongside fellow comedian Owen Powell, in an attempt to find a person from every nationality living in London. After a year's search, they finally managed to meet people from 189 of the UN's 192 countries, and hence suggested there is nobody in the capital from Tuvalu, Palau or the Marshall Islands.[10]

Horne appeared as a contestant on Countdown in August 2008, winning three matches before being defeated.[11] He also won the inaugural Comedians' Countdown Competition held at the Edinburgh Festival in the same month, beating Mark Watson and Stephen Grant to lift the trophy.

Horne acted as the on-stage expert responsible for graphics and sound-effects on the quiz show We Need Answers.

In 2011, Horne appeared on BBC1's Celebrity Mastermind. His specialist subject was the comedian Ken Dodd. He finished in 2nd place with a score of 25.

From 2015, Horne has served as co-host alongside Greg Davies in the Dave series Taskmaster, which he created. From 2017, Horne will also serve as co-host in the US remake of the show – which carries a shorter, but similar format to the UK series.